JEE Main

Yes, you will get a cut-off probably around 100.

Hello,
I hope you are doing well. You can check the list of college including NITs and IIITs, you can get according to your marks and rank here.
Use Shiksha JEE College Predictor:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=7489993.

Firstly, I would like to appreciate your mindset for aiming 300 marks in JEE main exam. Yes, you can definitely get such mark but all you have to do is to get all your concept clear and keep on hard working continuously and by doing this you can achieve good marks.

You may have chance of getting seat in NIT please visit www.siksha.com/jeemaincollegepredictor.

According to my knowledge, your seat is good enough to get admission in Sharda University. You can try to get admission as Sharda University is a very good institution and you may get admission. So, you can try to get admission.
Good luck.

Admission is based on the rank obtained in NATA. Interested candidates can apply online with the required information. Minimum Eligibility to Apply is a pass mark of 60% in class 12 with Mandatory Subject : Mathematics
Or
Must have completed diploma with at least 60% marks from recognized institute. Regards.

It is based upon your interest to choose between various universities.
I suggest Presidency. Vignan is also not bad.

Yes, you can apply but there are low chances for selection (If you are from general category). Hope for the best. You can surely apply. For applying to NIT you have to register yourself at JOSSA site. And fill up your respective NIT and branch you are interested in.

Just minimum of 75 Percent if you are from CBSE. It's a threshold score for IIT. Better to be above this score. And till now, syllabus hasn't been changed much.